TrustFire good quality 25500 4000mAh e-cigarette battery 3.7 battery li ion battery from TrustFire manufacturer
We are a original factory(OEM).
The protection board of battery is made of fiberglass.
so adding protection board or not ,you can choose.
Certainly, the adding is higher price than not.
Function of protection board: Avoid over-charge, over-recharge and overcurrent
Please feel free to contact us , if you have any question, We are willing to resolver everything for you. I will be on service of you until you are satisfied with your purchase.
Name:Ms Ina Liu
24h Hot Line:0086-13538686232